Grating



Oct. 6, 1925.

A. BECKER GRATING Filed Dec. 24. 1921 pmnummu Patented Oct. 6, 192.5.

V UNITED STATES isaaeaa PATENT OFFICE.

AXEL BECKER, OF CHICAGO, ILLINOIS, ASSIGNOB TO DAUCHY IRON WORKS, OF

CHICAGO, ILLINOIS, .A CORPORATION OF ILLINOIS.

GRATING.

Application filed December 24, 1921.

The main objects of this invention are to provide a reticulated metalgrating made up of bars having slits of predetermined length cut thereinat stated intervals whereby portions of the bar may be offset from thenormal plane thereof and attached to adjacent bars so as to secure saidbars in uniformly spaced relation; to provide a grating of this kindwherein the spacing is such that it will afford a firm foothold forpersons walking thereupon and also permittrucking thereacross; toprovide a reticulated grating which is made up of bars of substantiallyidentical construction; and to provide a grating which is simple tomanufacture and durable in construction.

An illustrative embodiment of this invention is shown in theaccompanying drawings, wherein Figure 1 is a fragmentary perspectiveview of a form of grating embodying this invention.

Figure 2 is an enlarged fragmentary plan of the same.

Figure 3 is a side elevation of the same.

the line H of Figure 2.

A grating constructed in accordance with this invention involves the useof a plurality of bars parallelly arranged on edge with sheared portionsof one bar offset from the normal plane thereof and rigidly attached tothe adjacent bars so that said bars are secured together in uniformlyspaced relation with the upper edges of all of the bars disposed in thesame horizontal plane.

In the specific embodiment herein shown the bars are of identicalconstruction the bars being slit at intervals along their length so asto permit two marginal portions and an intermediate portion to be offseton re- Figure 4 is a transverse section taken on Serial No. 524,801.

spectively opposite sides of the normal plane of the respective bar.These offset portions are shaped so as to have an interfittingarrangement whereby they form spacers for securing the bars in uniformlyspaced parallel relation.

Referring to the drawings the bars, which are of uniform rectangularcross section, each have formed therein a plurality of pairs oflongitudinally extending slits 2 located at intervals along the lengththereof and spaced so as to divide the bar into three equal portions.The two marginal portions 4 and the intermediate portion 5 adjacent eachpair of slits are offset from respectively opposite sides of the normalplane of the bar. These offset portions are of arcuate form and arrangedso that when the bars are assembled to form a grating the intermediateportion 5 on one bar fits in between and is adapted to be welded to themarginal offset portions 4 of the adjacent bar.

Preferably the marginal portions 4: are offset first to one side of thenormal plane of the bar and then to the other side as is also theintermediate portion as clearly appears from Figures 1 and 2 of thedrawings.

In making up a grating of this kind a predetermined number of the bars 1are arranged on edge side by side 'so that the ends of the bars areadapted to rest upon flanges of a suitable frame (not shown). The barsare placed relative to each other so that the intermediate ofl'setportions 5 of one barv fit in between the marginal offset portions 4 ofthe adjacent bars. These interfitting 011'- set portions are spot weldedtogether with suitable well known mechanism'whereupon the bars arerigidly secured in uniformly spaced parallelrelation to form aunitarystructure. The size and arrangement of the offset portions is such thatthe openings in the finished gratings are all more or less uniformwhereby the grating presents a neat and ornamental appearance. The edgesof the bars are all disposed in the same horizontal plane and arearranged sufficiently close together to provide a firm and levelfoot-hold for persons treading thereon. The undulated character of theoffset portions serves to secure a foot on the grating.

Although but one specific embodiment of this invention has been hereinshown and described, it will be understood that numerous details of theconstruction shown may be altered or omitted Without departing from thespirit of this invention as defined by the following claims.

I claim 1. A reticulated grating Comprising a plurality of bars arrangedon edge said bars being slit at intervals along their lengthsand eachbar having portions thereof adjacent to said slits bodily offset inopposite directions from the normal plane of the intermediate unslitpart of the respective bar, the offset portions of one bar being rigidlysecured to the adjacent bars whereby said bars are retained in uniformlyspaced parallel relation.

2. A reticulated grating con'iprising a plurality of bars arranged onedge said bars being slit at intervals along their lengths and each barhaving portions thereof adjacent to said slits bodily offset in oppositedirections from the normal plane of the intermediate unslit part of therespective bar, the offset portions of one barbeing adapted to haveinterfit-ting relation with the offset portions of the adjacent barswhereby said bars are rigidly secured together in uniformly spaced,parallel relation.

A reticulated" grating comprising a plurality of bars arranged on edgeeach of said bars having pairs of slits'formed therein at intervalsalong the length thereof, the marginal port-ions. of said bars adjacentto said slits being offset to one side of the norvmal plane of the barand the intermediate portion being offset to the opposite side, the

offset portions of one bar engaging the off set portions on the.adjacent bars whereby said bars are secured together in uniformly spacedparallel relation.

4. A reticulated grating comprising a plurality. ofbars arranged' onedge each of said bars having pairs of slits formed therein at intervalsalong the length thereof, the marginal portions of said bars adjacent.to

said slits being offset to one side of the normal plane of the bar andthe intermediate portion being offset to the opposite side, theintermediate offset portions of one bar fitting between and beingadapted to be fastened to the marginal offset portions of adjacent barswhereby said bars are rigidly secured together in uniformly spacedparallel relation.

5-. A reticulated metal structure compris ing a plurality of barsarranged on edge, said bars being slit at intervals along their lengthand each bar having portions thereof adjacent to said slits bodilyoffset from the normal plane of the intermediate unslit part of therespective bar, the offset portions of one bar overlapping andinterfitting with the offset portions of the adjacent bar and beingwelded at said overlapping interfittingportions so as to rigidly securesaid bars together. 7

6. A reticulated metal structure comprising a plurality of bars arrangedon edge, said bars havinggrou-ps of slits formed therein at intervalsalong their lengths, each group ofslits comprising-a plurality ofparallel slits arranged one above the other between the edges of thebar, each bar having portions thereof between said slits bodily offsetin opposite directions from the normal plane of the intermediate unslitportion of said bar, the offset portions of one bar overlapping andinterfittingwith the offset portions of the adjacent bar in planesintermediate and parallel to said bars, and being welded at saidoverlapping interfitting por t=1ons so as to rigidly secure said barstogether.

of the offset portions of the-next bar and said overlapped portionsbeing rigidly fastened together.

Signed at Chicago this 20 day of Dec.

' AXEL BECKER,

